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Integrated circuit, analog-digital converter and CMOS image sensor with the same

a technology of integrated circuits and image sensors, applied in the field of integrated circuit design, can solve problems such as power noise, deterioration of gain, and reduction of resolution of comparators, and achieve the effects of reducing voltage level differences, reducing power noise, and reducing offset and deterioration of gain

Active Publication Date: 2015-04-07
SK HYNIX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This solution secures gain margin, maximizes amplification gain, and relieves power noise, thereby enhancing the operational performance of CMOS image sensors by effectively managing voltage differences and noise in the power domains.

Problems solved by technology

According to the conventional technology, when the power domain is changed from an analog power domain of the comparator to a digital power domain of the counter, offset may occur and the gain may be deteriorated due to the voltage level difference between the two power domains.
The deteriorated gain of the comparator causes the resolution of the comparator to be decreased.
In addition, power noise is caused due to the operation characteristics of an inverter-type amplifier circuit included in the analog-digital converter and may become a concern.

Method used

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  • Integrated circuit, analog-digital converter and CMOS image sensor with the same
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  • Integrated circuit, analog-digital converter and CMOS image sensor with the same

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Embodiment Construction

[0026]Exemplary embodiments of the present invention will be described below in more detail with reference to the accompanying drawings. The present invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. Throughout the disclosure, reference numerals correspond directly to the like numbered parts in the various figures and embodiments of the present invention.

[0027]Throughout the present specification, when a certain part is described to be ‘connected to’ another part, it means not only a ‘direct connection’ but also an ‘electrical connection’ with another device between the two parts. Also, when a particular part is described to ‘include’ or ‘have’ a particular constituent element, it does not exclude the presence of another consti...

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Abstract

A integrated circuit includes an analog power domain circuit having more than one stages, a digital power domain circuit having at least one stage receiving the output signal of the analog power domain circuit, and a voltage regulating unit suitable for supplying at least one scaled power to the latter part of the stages to reduce a voltage level difference between the analog power domain circuit and the digital power domain circuit.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority of Korean Patent Application No. 10-2013-0059098, filed on May 24, 2013, which is incorporated herein by reference in its entirety.BACKGROUND[0002]1. Field[0003]Exemplary embodiments of the present invention relate to an integrated circuit design, and more particularly, to a complementary metal oxide semiconductor image sensor.[0004]2. Description of the Related Art[0005]A conventional column-parallel CMOS image sensor (hereinafter, referred to as a CMOS image sensor or a CIS) includes a plurality of analog-digital converters (ADCs), a plurality of buffer memories, and a plurality of sense amplifiers. The analog-digital converters convert analog signals that are sensed in a pixel array, where a plurality of pixels are arrayed, into digital signals.[0006]Herein, each of the analog-digital converters includes a voltage generator for generating a reference signal, for example, a ramp signal VRAMP, a co...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H03M1/12H03M1/00H04N5/378
CPCH04N5/378H03M1/002H03M1/12H03M1/0609H03M1/123H03M1/56H04N25/78H04N25/76H04N25/75
Inventor SOHN, YOUNG-CHUL
Owner SK HYNIX INC